He showed up at Zeng's home the next day with a blackboard, a ruler and a box of chalks.

第二天，他带着一块黑板、一把尺子和一盒粉笔来到曾的家里。

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There is a box fixed beneath the chalk rail of the blackboard.

黑板下方横木条底下设有一个盒子。

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There is a box fixed beneath the chalk rail of the blackboard.

黑板下方横木条底下设有一个盒子。

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